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Some Covid vaccine studies suggest antibody levels wane over time. Dr Natalia Freund, a leading immunologist at Tel Aviv University, explains how this is common with other diseases and that it doesn鈥檛 necessarily mean an individual isn鈥檛 protected.

So are 鈥渂ooster鈥� jabs necessary? Adam Finn, professor of paediatrics at the University of Bristol, assesses the evidence.

Prof Salim Abdool Karim, a clinical infectious disease epidemiologist and a Member of the African Task Force on Coronavirus, questions the ethics around giving people a third vaccine, considering so many people have not received a single dose.

(Image: Doctor offers plaster to woman after she receives a vaccine, Credit: Jasmin Merdan/Getty Images.)